liǎng / zhǒng / yán / sè / róng / hé / de / hún / rán / yī / tǐ / kàn / bu / chū / míng / xiǎn / de / jiè / xiàn

两种颜色融合得浑然一体，看不出明显的界线。

The two colors blend into a seamless whole, with no clear boundary.